MMC Card vs. SD Card

What's the Difference?

MMC (MultiMediaCard) and SD (Secure Digital) cards are both types of memory cards commonly used in electronic devices such as cameras, smartphones, and tablets. While they share similarities, there are a few key differences between the two. Firstly, SD cards are generally more popular and widely used compared to MMC cards. SD cards also have a higher storage capacity, with options ranging from a few gigabytes to several terabytes, whereas MMC cards typically have a maximum capacity of 4GB. Additionally, SD cards offer faster data transfer speeds and are more durable, making them a preferred choice for professional photographers and videographers. However, MMC cards are often more affordable and can still be found in older devices that do not support SD cards.


AttributeMMC CardSD Card
SizeVaries (up to 32GB)Varies (up to 2TB)
Dimensions24mm x 32mm x 1.4mm24mm x 32mm x 2.1mm
Speed ClassN/AClass 2, 4, 6, 10, UHS-I, UHS-II, UHS-III
CompatibilityCompatible with MMC slotsCompatible with SD slots
Write ProtectionVaries (some models support write protection)Varies (some models support write protection)
File SystemFAT12, FAT16, FAT32FAT12, FAT16, FAT32, exFAT
UsagePrimarily used in older devicesCommonly used in digital cameras, smartphones, and other devices
CapacityUp to 32GBUp to 2TB
ManufacturerMultiple manufacturersSD Association

Further Detail


When it comes to portable storage solutions, MMC (MultiMediaCard) and SD (Secure Digital) cards are two popular options that offer convenience and versatility. Both cards are widely used in various devices, including digital cameras, smartphones, tablets, and more. While they may seem similar at first glance, there are several key differences between MMC and SD cards that are worth exploring. In this article, we will compare the attributes of MMC cards and SD cards, highlighting their similarities and differences to help you make an informed decision when choosing the right card for your needs.

Physical Attributes

One of the primary differences between MMC and SD cards lies in their physical attributes. MMC cards are slightly smaller in size compared to SD cards, measuring approximately 24mm x 32mm x 1.4mm. On the other hand, SD cards are slightly larger, measuring approximately 24mm x 32mm x 2.1mm. This size difference means that MMC cards can fit into SD card slots, but SD cards may not fit into MMC card slots due to their increased thickness. Additionally, SD cards have a write-protect switch on the side, allowing users to protect their data from accidental deletion or modification, which is not present in MMC cards.

Storage Capacity

Both MMC and SD cards offer a wide range of storage capacities to suit different needs. Initially, MMC cards had a maximum storage capacity of 128MB, while SD cards started with a maximum capacity of 2GB. However, with advancements in technology, both card types now offer much higher capacities. SD cards are available in various capacities, ranging from a few gigabytes to several terabytes, making them suitable for storing large amounts of data, including high-resolution photos and videos. MMC cards, on the other hand, have a maximum capacity of 4GB, which may be sufficient for basic storage needs but may fall short for users requiring larger storage capacities.


When it comes to compatibility, SD cards have an advantage over MMC cards. SD cards are backward compatible with devices that support MMC cards, meaning they can be used in MMC card slots without any issues. However, the reverse is not true. MMC cards may not work in SD card slots due to differences in the electrical interface and the absence of a write-protect switch. Therefore, if you have a device that only supports MMC cards, you may not be able to use SD cards as an alternative. It is important to check the compatibility of your device before choosing between MMC and SD cards.

Speed and Performance

Both MMC and SD cards offer different speed classes to indicate their performance capabilities. SD cards are classified into different speed classes, including Class 2, Class 4, Class 6, and Class 10, with each class representing a minimum sustained write speed. These speed classes are essential for applications that require fast data transfer, such as recording high-definition videos or capturing burst-mode photos. On the other hand, MMC cards do not have standardized speed classes, which means their performance may vary depending on the manufacturer and model. While some MMC cards may offer comparable speeds to certain SD card classes, it is generally safer to opt for an SD card if you require consistent and reliable performance.

Usage and Applications

Both MMC and SD cards find applications in a wide range of devices, including digital cameras, smartphones, tablets, gaming consoles, and more. However, SD cards have gained more popularity and widespread usage due to their compatibility with a broader range of devices and higher storage capacities. SD cards are commonly used in professional photography and videography, where large amounts of data need to be stored and transferred quickly. MMC cards, on the other hand, are more commonly found in older devices or specific applications where their smaller size and lower capacity are sufficient for basic storage needs.


Price is often a significant factor when choosing between MMC and SD cards. Generally, MMC cards tend to be more affordable compared to SD cards, especially when comparing cards with similar storage capacities. This price difference can be attributed to the higher demand and wider availability of SD cards in the market. However, it is important to consider your specific requirements and the compatibility of your devices before solely basing your decision on price. Investing in an SD card may be a better long-term option if you have devices that support SD cards and require larger storage capacities.


In conclusion, MMC and SD cards are both popular portable storage solutions that offer convenience and versatility. While MMC cards are smaller in size and more affordable, SD cards have the advantage of larger storage capacities, backward compatibility, standardized speed classes, and wider usage. When choosing between MMC and SD cards, it is crucial to consider factors such as physical attributes, storage capacity, compatibility, speed and performance, usage, and price. Assessing your specific needs and the requirements of your devices will help you make an informed decision and select the card that best suits your needs.

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